#include <bits/stdc++.h>
using namespace std;

int main()
{
    int n,m,p;
    int l[100000 + 5],r[100000 + 5],x[100000 + 5];
    cin>>n>>m>>p;
    for(int i = 1; i <= m; i ++)cin>>l[i]>>r[i];
    for(int i = 1; i <= p; i ++)cin>>x[i];

    int ans = 0;
    for(int i = 1; i <= m; i ++)
    {
        int dem = 0;
        for(int j = 1; j <= p; j ++)
        {
            if(l[i] <= x[j] and x[j] <= r[i])dem++;
        }
        if(dem == 0)ans ++;
    }
    cout<<ans;

    return 0 ;
}